ACS401 Просмотр технического описания (PDF) - Semtech Corporation
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ACS401 Datasheet PDF : 8 Pages
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t
t
wh
wl
TxCL and RxCL clock pulse widths
t
r
t
f
90 %%
90 %
10 %%
10 %%
Digital Outputs rise and fall times
TxCL
t
t
sut
ht
RxCL
t
t
sur
hr
TxD
RxD
Transmit set-up and hold times
Receive set-up and hold times
Figure 2. Timing diagrams
VD+ pins 19, 20, 29 and 67.
GND pins 3, 10, 16, 17, 36, 41 and 4.3
V+
+5V
GND
47µµHH
1 kΩ
10 nF
GND
47µHµH
47 µHµF
100 nF
ACS401 GND
100 nF
VG+
CON1
ACS401 CON2
TRC
VA+
SETB
VD+
GND
AGND
CNT
Pin 48 and Pin 51
should be connected
together
Rtrc > 800 Ω
ACS401 GND
22-
100 nF
All capacitors should be placed
very close to the ACS401.
Figure 3. Recommended power supply layout
ACS401 GND
ACS401
TxD1
RxD1
TxD2
RxD2
TxD3
RxD3
TxD4
RxD4
XI1
XO1
XI2
XO2
Single Fiber Link
ACS401
RxD1
TxD1
RxD2
TxD2
RxD3
TxD3
RxD4
TxD4
XO1
XI1
XO2
XI2
Figure 4. 6 Full-duplex channels over a single fiber
4 **Synchhrroonnoouuss
CChhaannnneells
4 **AAssynchroonnoouuss
CChhaannnneells
Single Fiber LED link
Link Budget Example (Rtrc set so LED launch current = 100 mApeak)
Fibertype
Plastic
Glass
Glass
Fibersize
1000 micron 62.5 micron 50 micron
Minimum transmit couple power to fiber (µW) 1000
100
50
Minimum LED responsivity (AW)
0.01
0.1
0.12
Minimum ACS401 sensitivity (nA)
500
500
500
Minimum input power to ACS401 amplifier (µW) 50
5
4.1
Link budget (dB)
13
13
11
Single Fiber Duplex LASER link
Link Budget Example (LASER launch power = 1 mW)
Fibertype
Glass (single mode)
Fibersize
9 micron
Minimum transmit couple power to fiber (µW)
1000
Minimum PIN responsivity (AW)
0.35
Minimum ACS401 sensitivity (nA)
500
Minimum input power to ACS401 amplifier (µW)
1.43
Link budget (dB) (single mode fiber attenuation = 0.3 dB km) 28.4
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